Whether it is legal to hold Feng Shui classes online requires a comprehensive judgment based on local laws, regulations and policies.

Feng Shui is part of traditional Chinese culture. It involves many aspects of human life, such as destiny, marriage, family, career, etc. However, Feng Shui is not a science, it is a cultural tradition and belief, so it is not scientific.

Therefore, if the online Feng Shui class complies with local laws, regulations and policies, and is approved by the relevant departments, then it is legal. However, if running a Feng Shui class online violates local laws, regulations and policies, or is not approved by the relevant departments, then it is illegal.